Number of Dyck paths of semilength n such that the maximal number of peaks per level equals two.

A288743

Number of Dyck paths of semilength n such that the maximal number of peaks per level equals two.

Terms

    a(0) =1a(1) =1a(2) =7a(3) =18a(4) =59a(5) =193a(6) =616a(7) =1955a(8) =6244a(9) =19926a(10) =63490a(11) =202068a(12) =642816a(13) =2044571a(14) =6502193a(15) =20673020a(16) =65714586a(17) =208870774a(18) =663868055a(19) =2109997964a(20) =6706282384a(21) =21315049217a(22) =67748772174a(23) =215343287489a(24) =684507346839

External references